Update mcd(4) to use disk_lock, etc. instead of its own tsleep(9) based locking.
Update mcd(4) to use disk_lock, etc. instead of its own tsleep(9)
based locking.

ok gcc

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars